The calculated distance (air line) between Mahilyow and Svyetlahorsk is approximately 92 miles respectively 148 kilometers.
By car or train, the actual journey to Svyetlahorsk is certainly longer, as only the direct route (as the crow flies) between Mahilyow and Svyetlahorsk has been calculated here.
Air line (approximately)
148 kilometers
80 nautical miles